:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border: #30363d;
  --border-light: #21262d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --orange: #f5a623;
  --purple: #bc8cff;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.3);
  --transition: 150ms ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* ─── Topbar (统一导航) ─── */
.topbar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}
.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  padding: 0 24px;
  height: 56px;
  gap: 8px;
}
.topbar-brand {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-right: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}
.topbar-brand:hover { text-decoration: none; }
.topbar-nav {
  display: flex;
  gap: 2px;
  flex: 1;
}
.topbar-nav a {
  color: var(--text-secondary);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 13px;
  white-space: nowrap;
  transition: all var(--transition);
  text-decoration: none;
}
.topbar-nav a:hover,
.topbar-nav a.active {
  color: var(--text-primary);
  background: var(--bg-tertiary);
  text-decoration: none;
}
.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}
.topbar-user {
  color: var(--text-secondary);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.topbar-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
}
.btn:hover { background: var(--border); border-color: var(--text-muted); }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-success { background: #238636; color: #fff; border-color: #238636; }
.btn-success:hover { background: #2ea043; }
.btn-danger { background: #da3633; color: #fff; border-color: #da3633; }
.btn-danger:hover { background: #f85149; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-lg { padding: 12px 24px; font-size: 15px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ─── Cards ─── */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.card-header {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ─── Forms ─── */
.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 14px;
  font-family: var(--font);
  transition: border-color var(--transition);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(88,166,255,.15);
}
.form-textarea { min-height: 80px; resize: vertical; }
.form-help { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.form-error { font-size: 12px; color: var(--danger); margin-top: 4px; }

/* ─── Data Table ─── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.data-table th {
  text-align: left;
  padding: 10px 12px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
}
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-light);
}
.data-table tr:hover td { background: rgba(255,255,255,.02); }

/* ─── Badges ─── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
}
.badge-success { background: rgba(63,185,80,.15); color: var(--success); }
.badge-warning { background: rgba(210,153,34,.15); color: var(--warning); }
.badge-danger  { background: rgba(248,81,73,.15); color: var(--danger); }
.badge-info    { background: rgba(88,166,255,.15); color: var(--accent); }

/* ─── Modals ─── */
.modal-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,.6);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
  animation: fadeIn .15s ease;
}
.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0,0,0,.4);
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
  font-size: 16px; font-weight: 600;
}
.modal-close {
  cursor: pointer;
  color: var(--text-muted);
  font-size: 20px;
  background: none; border: none;
  line-height: 1;
}
.modal-close:hover { color: var(--text-primary); }

/* ─── Container ─── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}
.container-sm { max-width: 480px; }
.container-md { max-width: 800px; }

/* ─── Toast ─── */
.toast-container {
  position: fixed;
  top: 72px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 20px;
  font-size: 13px;
  box-shadow: var(--shadow);
  animation: slideIn .2s ease;
  display: flex; align-items: center; gap: 8px;
  min-width: 280px;
}
.toast-success { border-left: 3px solid var(--success); }
.toast-error   { border-left: 3px solid var(--danger); }
.toast-info    { border-left: 3px solid var(--accent); }

/* ─── Animations ─── */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }
@keyframes spin { to { transform: rotate(360deg); } }
.fade-in { animation: fadeIn .3s ease; }
.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .6s linear infinite;
  display: inline-block;
}

/* ─── Utility ─── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }
.text-center { text-align: center; }
.text-sm { font-size: 12px; color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.w-full { width: 100%; }
.hidden { display: none; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

/* ─── Empty State ─── */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.empty-state-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state-text { font-size: 15px; margin-bottom: 8px; }
.empty-state-hint { font-size: 13px; }

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .topbar-inner {
    padding: 0 12px;
    gap: 6px;
    flex-wrap: nowrap;
  }
  .topbar-brand {
    margin-right: 8px;
    font-size: 13px;
    gap: 4px;
  }
  .topbar-brand span { display: none; }
  .topbar-nav { gap: 2px; flex: unset; }
  .topbar-nav a { padding: 6px 6px; font-size: 11px; }
  .topbar-right { gap: 4px; }
  .topbar-right .btn-sm { padding: 4px 8px; font-size: 11px; }
  .container { padding: 16px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}